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When the above conditions are all met and the focus is

closed, the XSI pin goes to low from the current high,

then 40 ms later, the microcomputer begins to monitor

the RFOK signal after it that has been passed through

the low pass filter.

When the RFOK signal is recognized as low, the micro

computer carries out various actions including protec-

tion.

Fig.11 a series of operations carried out relevant to the

focus close (the figure shows the case where focus

close is not available).

You can check the S-curve, search voltage and actual

lens behavior by selecting the Display 01 for the focus

mode select in the test mode, and then pressing the

focus close button.

LENS POSITION

RELATIVE TO DISC

NEAR

FAR

Expanding around "Just Focused Point"

RFI

FOK

FZD

(INTERNAL SIGNAL)

Focus closing would normally take place at these points

XSI

(IN THE EVENT

FOCUS IS

CLOSED)

Fig.11 : FOCUS CLOSE SEQUENCE

YPM-2306ZF

REFO

"JUST FOCUSED"

LEVEL

REFO

FZD

THRESHOLD

LEVEL